Results 21 to 30 of about 518,428 (215)

Research Progress of Locally Resonance Acoustic Metamaterials [PDF]

E3S Web of Conferences, 2021
Bragg scattering phonon crystal and locally resonant acoustic metamaterials were introduced. In order to generate noise reduction, the lattice constant of Bragg scattering phonon crystal should be of the same order of magnitude as the wave length of the ...
Zhehua Du
doaj   +1 more source

A review of underwater acoustic metamaterials for underwater acoustic equipment

Frontiers in Physics, 2022
Researchers use underwater acoustic equipment to explore the unknown ocean environment, which is one of the important means to understand and utilize the ocean.
Zhenjing Zhu, Zhenjing Zhu, Ning Hu, Ning Hu, Junyi Wu, Wenxin Li, Wenxin Li, Jiabao Zhao, Jiabao Zhao, Maofa Wang, Maofa Wang, Maofa Wang, Fanzong Zeng, Fanzong Zeng, Huajie Dai, Huajie Dai, Yongju Zheng, Yongju Zheng   +17 more
doaj   +1 more source

Review and prospects of metamaterials used to control elastic waves and vibrations

Frontiers in Physics, 2022
Acoustic metamaterials, artificial composite structures with exotic material properties used to control elastic waves, have become a new frontier in physics, materials science, engineering and chemistry.
Huajie Dai, Huajie Dai, Xueting Zhang, Yongju Zheng, Yongju Zheng, Wanrong Pei, Rougang Zhou, Rong Liu, Youping Gong   +8 more
doaj   +1 more source

Moth wings are acoustic metamaterials. [PDF]

Proc Natl Acad Sci U S A, 2020
Significance Bats and moths are embroiled in an evolutionary arms race. Using ultrasonic biosonar, bats detect their insect prey, which in turn deploy diverse strategies to avoid predation. Here, we show that some moth species evolved wings covered with a canopy of scales that reduces ultrasonic echoes.
Neil TR, Shen Z, Robert D, Drinkwater BW, Holderied MW.   +4 more
europepmc   +7 more sources

Control the structure to optimize the performance of sound absorption of acoustic metamaterial: A review

AIP Advances, 2021
Acoustic metamaterials achieve the function of absorbing sound through equivalent negative parameters and bandgaps. Sound absorption is closely related to structural design.
Yan Du, Weiguo Wu, Wei Chen, Yongshui Lin, Qingjia Chi   +4 more
doaj   +1 more source

Bandgap optimization for chiral acoustic metamaterials based on material selection method

Zhongguo Jianchuan Yanjiu, 2023
ObjectivesThis study seeks to expand the bandgap frequency band, reduce the bandgap starting frequency and analyze and optimize the bandgap parameters of acoustic metamaterials.
Luyun CHEN, Xing XIE
doaj   +1 more source

Engineering Acoustic Metamaterials for Sound Absorption: From Uniform to Gradient Structures [PDF]

IScience, 2020
Xiuhai Zhang, Zhiguo Qu
exaly   +2 more sources

Transcranial Acoustic Metamaterial Parameters Inverse Designed by Neural Networks

BME Frontiers, 2023
Objective: The objective of this work is to investigate the mapping relationship between transcranial ultrasound image quality and transcranial acoustic metamaterial parameters using inverse design methods.
Yuming Yang, Dong Jiang, Qiongwen Zhang, Xiaoxia Le, Tao Chen, Huilong Duan, Yinfei Zheng   +6 more
doaj   +1 more source

Acoustic Metamaterials and Acoustic Foams: Recent Advances [PDF]

Applied Sciences, 2022
Acoustic metamaterials are synthetic materials, made of repeating unit cells that are designed to address an acoustic problem, through the rational design of their micro-features [...]
Reza Hedayati, Mahdi Bodaghi
openaire   +3 more sources

Efficient Modelling of Acoustic Metamaterials for the Performance Enhancement of an Automotive Silencer

Acoustics, 2022
Significant potential for acoustic metamaterials to provide a breakthrough in sound attenuation has been unlocked in recent times due to advancements in additive manufacturing techniques.
Daniel Deery, Lara Flanagan, Gordon O’Brien, Henry J. Rice, John Kennedy   +4 more
doaj   +1 more source